<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <button id="btn">点击获取</button>
  <script>
    //axios
    function sendAJAX(url){
      return new Promise ((resolve,reject)=>{
        const xhr = new XMLHttpRequest()
        xhr.responseType = 'json'
        xhr.open('GET',url);
        xhr.send();
        //处理结果
        xhr.onreadystatechange = function(){
          if(xhr.readyState === 4){
            //判断成功
            if(xhr.status >= 200 && xhr.status < 300){
              //成功的结果
              resolve(xhr.response);
            }else{
              reject(xhr.status);
            }
          }
        }
      })
    }

    //段子接口地址https://api.apiopen.top/getJoke
    let btn = document.querySelector('#btn');
    btn.addEventListener('click',async function(){
      //获取段子信息
      let duanzi = await sendAJAX('https://api.apiopen.top/getJoke')
      console.log(duanzi);
    })
  </script>
</body>
</html>